5.3 Classical sound level meter and averager integrator function
The sound level meter processes the signal sound pressure and simultaneously provides the following information :
• LXY : the sound pressure level weighted temporally.
• LXYmax and LXYmin : maximum and minimum values of the levels on measurement time.
• Lupk : level of maximum peak of sound pressure on the measurement time.
• LXeq : equivalent continuous level of acoustic pressure frequency weighted on measurement time.
5.3.1 Adjustment prior to measurement
1 – Select L-Leq mode : move the cursor with arrow keys to 1 and select 'L-Leq' with the scrolling knob key.
2 – Select the weighting frequency and the time weighting.
For each weighting frequency, the sound level meter proposes the measurement according to three time
weightings : Fast (F) – Slow (S) – Impulse (I). Possible choices are :
A frequency weighting : LAF – LAS – LAI
C frequency weighting : LCF – LCS – LCI
Z frequency weighting : LZF – LZS – LZI
Place the cursor with arrow key on the area 2 and select with scrolling knob identified measurement
criteria among the possibilities listed above.
3 – Select the weighting frequency of peak level of sound pressure : move the cursor with the arrows to 3
and select C or Z with the scrolling knob key.
5.3.2 Launch the measurement
In manual mode : directly press icon ,the timer starts and shows the measurement time. This time is
limited to 24 hours.
In I/O mode : see chapter « Launching a measurement in I/O mode ».
5.3.3 During measurement
During measurement, three screens inform the current measurement. They are accessible through the
scrolling knob key.
E1 : it is the main screen that displays the instantaneous measurements.
• LXY : the sound pressure level weighted temporally.
• LXeq : equivalent continuous level of sound pressure frequency weighted on measurement time.
• LUpk : level of maximum peak of sound pressure on the measurement time.
• Duration of the measurement expressed in DD / HH: MM: SS
E2 : This screen contains results of values that will be stored in memory at the end of measurement :
• LUpk : level of maximum peak of sound pressure on the measurement time.
• LXYmax : maximum value of sound pressure level weighted temporally met since the beginning of
the measurement.
• LXYmin : minimum value of sound pressure level weighted temporally met since the beginning of
the measurement.
• LXeq : equivalent continuous level of acoustic pressure frequency weighted on measurement time.
• LXE : level of exposure to sound frequency weighted
• D : Measurement time expressed in DD / HH: MM: SS
• % : percentage of saturation of the input stage.
13 Make some measurements
Procedure
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Screen 1
Screen 2
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